/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Builds up a model from a given set of brushes. Used by BspConversionTool to build brushes before converting them to static meshes.
void RebuildModelFromBrushes ( [TArray](API\Runtime\Core\Containers\TArray)< [ABrush](API\Runtime\Engine\Engine\ABrush) * > & BrushesToBuild, [UModel](API\Runtime\Engine\UModel) * Model )